Thermostatic trip-switch device.



I. JACKSON THERMOSTATIG TRIP SWITCH DEVECE.

APPLICATION man sEPT..24, I915- lfia fiwe Patented ept, 4,191?

2 SHEETS-:SHEET I.

' 11v VENTOR. WITNES 5ES: JEssE Lac/r60 A TTORNE .l. JACKSON.

THERMOSTATIC TRIP SWITCH DEVICE.

APPLICATION man SEPT-24, I915.

Patented Sept. 4,1917.

2 SHEETSSHEET 2.

JEssE ha/rsa/v' A TTORNE YS.

JESSE JACKSON, OF KOKOMO,'INDIANA, ASSIGNOR TO GLOBE STOVE &

RANGE coM- IPANY, F KOKOMO, MICHIGAN.

THERMOSTA'I'IC TRIP-SWITCH DEVICE.

Specification of Letters Patent.

Patented Sept. 4, 1917.

Application filed September 24, 1915. Serial No. 52,496.

i To all whom it may concern:

Be it known that I, J nssn J AcKs'oN, a citizen of the United States,residing at Kokomo, county of Howard, State of Indiana, have inventedcertain new and useful Improvements in Thermostatic Trip-Switch Devices,of which the following is a specification.

This invention relates to improvements in thermostatic trip switchdevices for electric stoves and ovens.

The main objects of this invention are:

First, to provide a control device, especially an electric switch, whichis tripped automatically by thermostatic action at any readily regulatedpoint.

' Second, to provide for the setting of the trip mechanism and adjustingfor the desiredtemperature for tripping by a simple manipulation of asingle operating lever or handle.

Further objects, and objects relating to structural details andeconomies of construction and operation, will definitely appear from thedetailed description to follow.

I accomplish the objects of my invention by the devices and meansdescribed in .the following specification. The invention is clearlydefined and pointed out in the claims. A structure which is a preferredembodiment of my invention is clearly illustrated in the accompanyingdrawing forming a part of this specification, in which:

Figure I is a side elevation of my thermostatic control device with theconnections to the supply circuit for the heater shown.

Fig. II is a side elevation of my thermostatic control device with thecover removed showing the switch and trip mechanism.

Fig. III is a detail vertical section through the indicator dial andmeans for setting the adjusting lever or handle, taken on a linecorresponding to section line 3-3 of Fig. I.

Fig. III is a detail vertical section taken on line 33 of Figs. I andIII.

Fig. IV is a detail vertical section showing the trip mechanism whenset, the same released being shown dotted, taken on a line correspondingto the section line 4. 1 of Fig. 11.. v

- Fig. V is a detail vertical section through the switch taken on a linecorresponding to the section line 5-5 of Fig. II.

Fig. VI is a detail vertical section through the ad ustment of thethermostatic rod, taken on a line corresponding to the section l1ne 66of Fig. II.

Flg. VII is a detail horizontal section showing the fastening of thethermostatic rod at one end, taken on a line corresponding to thesection line 7-7 of Fig, I.

Fig. VIII is a detail vertical section showing the fastening of thethermostatic rod at one end, taken on a line corresponding to. thesection line 8-8 of Fig. VII. I

In the drawing similar reference characters refer to similar partsthroughout the several views,and the sectional views are taken lookingin the direction of the little arrows at the ends of the section lines.

In referring to the drawings, I consider the reference characters asrepresenting the parts themselves. 1 is a case which holds the tripmechanism and switch from which depend two supporting bars 2 securely engaging at their lower ends the block 3, the ends of the bars beinghooked under the same. Between tliese two supports is a thermostatic rod1, one end of which passes through block 3 and is pinned thereto. Rod 4is further guided by loosely passing through guide block 4 which issecurely fastened between bars. The other end of rod 4 is secured to anadjusting rod 5 which passes through the case 1. In one end of rod 5 isan adjusting screw 6, together with a lock nut 7. Adjusting screw 6bears against a latch 7 which is pivoted on a stud 8 securely bolted tothe case. Latch 7 is made to bear against adjusting screw 6 by thespring 8'. Latch 7 coacts with the catch 9 having a slot 10 at one end.The catch 9 turns about a pin which passes through the slot, said pinbeing'held in a partition 11. The pivoted member 12 of a switch turnsabout the pin 13 securely heldin partition 11" and's uitably insulatedtherefrom, said pin being connected to the heat supply circuit by wire13. Switch member 12 supports insulated fiber piece 14 to which ispivoted the adjusting arm 15, said arm passing through and projectingbeyond the case 1. The catch 9 is also pivoted to adjusting arm 15. Aswitch plate 16 is securely mounted to the case 1 and insulated there'from by a fiber piece 17. On this plate 16 is mounted the auxiliaryswitch spring 18,

19 in switch member 19. Into switch member 19 slides the pivoted switchmember 12, first making contact when member 12 bears against the knob ofspring 18. Plate 16 connects withthe supply circuit by wire 21.

When the switch is opened the knob on spring 18 follows in contact withswitch member 12 until it separates from switch member 19 and is thelast point of contact.

The case 1 is closed by the cover 22 to which is securely held a scale23. Through the slot 24 of scale 23 passes adjusting arm 15. On the endof arm 15 is secured a knob or handle 25. Over the rod 15 and disposedinside the handle 25 is the spring 26. A sleeve 27 slides on the rod 15and carries a pointer 27 which is urged against the scale by the spring26. A portion-of the lower end of the sleeve 27 projects into the slot 21 of the scale 23, therebypreventing.

the sleeve 27 from rotating about the rod 15 and holding the pointer 27'in proper relation to the scale. The curve of the scale is approximatelythe curve lgenerated by a given point on the rod 15 when the rod -15 isoscillated from left to right. It should be noted that when the rod 15.is swung either to the right or the left the pivot point between thecatch 9 and the rod 15 moves in a straight line and the pivot pointbetween the switch plate 12 and the rod 15 moves in" an are about thepivot point 13, thereby causing the curve to flatten out somewhat, asshown at the right hand end of the scale in Fig. IV. It will be clear,however, that a scale may be curved along different curves and thecalibration of the scale changed accordingly.

When the against latch 7, (see Fig. IV) and as the temperature rises rod1 expands thus raising latch 7. When the top of the rod reaches a givenheight, due to expansion of the rod,

the catch 9 is released and the switch is device is the heating coil 29,which may be in an oven or the like, which is opened or closed by theswitch 30.

Having thus described my invention, what device is set, the catch 9bears- I claim as new and desire to secure by Letters Patent is:

1. In an automatic thermostatic switch trip device, the combination withthe thermostat rod, a pivoted latch lever to cooperate with saidthermostat rod, a catch with a pivot disposed within a slot foradjustment to cooperate with said latch, a contact switch for closingthe electric heating circuit, a setting lever pivoted thereto andpivotally connected to said adustable catch for regulating the positionthereof to set the same to be released at a predetermined point, anactuating spring on said adjusting lever for putting tension on the saidswitch whereby it would be actuated when released, a suitable scale foraccurately positioning the said setting lever, all coactingsubstantially as described for the purpose specified.

2. In an automatic thermostatic switch to said adjustable catch forregulating the osition thereof to set the same to be reeased at apredetermined point, an actuating spring on said adjusting lever forputting tension on the said switch whereby it would be actuated whenreleased, a suitable scale for accurately positioning the said settinglever, all coacting substantially as described for the purposespecified.

3. In an automatic thermostatic switch trip device, the combination withthe thermostat rod, a pivoted latch lever to cooperate with saidthermostat rod, a catchwith a pivot disposed within a slot foradjustment to cooperate with said latch, a contact switch for closingthe electric heating circuit, a setting lever pivoted thereto andpivotally connected to said adjustable catch for regulating the positionthereof to set the same to be released at a predetermined point, anactuating spring on said adjusting lever for putting tension on the saidswitch whereby it would be actuated when released, all coactingsubstantially as described for the purpose specified.

In witness whereof, I have hereunto set my hand and seal in the presenceof two witnesses. v

JESSE JACKSON. L. S.

